Voltage-testing apparatus



Oct. 2,. 1928.

' J. W. HILL VOLTAGE TESTING APPARATUS Filed June s, 1926 Panarea oa. a, ieee.

conn wiLLIAi/i HILL, or sAL'r LAKE citer, UTAH; Assieivon er FORTYNINE o1vri l l inseln e nii-iran stares f earner aerien.

HUNDREDTHS TO JOHN T.Y GALEY, 0F SALT LAKE CETY, UTAH.

. VOLTAGE-TESTINGAPPARATUS.

Application sied time s, 192e. seiiai 1-io.,11e,5e3-.

f This invention relates to improvements in. 'The prongs involved are designated21,22

and 23.y YThe remaining terminal of each voltage testing apparatus, and it consists Vof the constructions, combinations and arrangements" herein described and claimed.

An object of the invention is to incorporate anA apparatus of simple arrangement in an Velectrical circuit7 morespecitcally a .radio receiifeiso that tlie potential applied to any desired unit, for example, thejiilament or 10 plate, may be instantly tested from time to time in order'to determine whether the voltage is of the desiredvalue. Y

Gther objects and advantages oi" the invention will appear in the following specilin cation, reference being had to the accom:-

panying drawing, which is ciagram ol". ,a y

radio receiving circuit to illustrate the application of the voltage testing apparatus.

As already indicated in the 'foregoing gene eral obJeet et' the invention the specific testing cireuitis intended to be incorporated in a radio receiver thereby forming an integral part thereof and permitting testing` of im# portant elements, for example the liliinent" and plate ot the respective tubes, from time to time in order `to determine whether the voltageis of the required value. Although v*the testing circuit is herein disclosedas be'- ticipatedthat' the principles thereofinay be embodied in ,circuits of a ditlerent nature. inasmuch as the testing circuit is incorpof rated with theradio receiver, the two may be identified as one apparatus. v l Y Reference is made to the drawings. This shows a typical radio receiver, parts ot'wliich are involved in 'the application of the invention. yIt comprises the radio frequency amplifier tube 1, the detector tube 2, and the audio frequency amplilier tube 3. In the respective instances these tubes include filamentsand plates 4, 5; 6, 7, and 8, 9.

Positive and negative busses 10 and 1 1 sup-4 ply the current from a familiar'ly designated A battery, for heating the various filaments 4, 6 and 8, the latter conducto-r also being connected with the B battery. The movable conductors 12, 13 and 14 of the rheostats 15, 16 and 17 have common connection with the positive bus 10. The rheostat resistances are connected Y with wires 18,19 and 2O which lead to one terminal of the respective filaments and tol one prong olf-suite able jacks., I

ving associated with a. radio receiver, it isy an-y .lilainent connected with the negative bus 11 as shown. 'i A .voltineter lis incorporated in the receiver in such amanner as to "be plainly visible. To this end it is` preferably of the' double lscale variety, thel lrstscale 28 applyingto lowvoltages such as are 4dealt' with in thefilrfunents, the other seale29 being readable in relatively high'voltages, suchas dealt with in th'ezplat'e circuits. y A

Russes El() and 81 have connection at 32 and- 83 with the positive voltmeter terminals'f26 and2. Both busses are positive. The `posi- .mounted uponlthe panel. The voltinete'riisy tive voltineter busrSO has connections v84, x35.,

and 36 With'the complementary prongs 87, 88

and 39 ofthe spring aclrs mentioned.

Upon desiringto test'or regulate the fila# ment voltage ofY any one of the tubes a plug 40 is 'thereby closing, the particular circuit, tofbe tested, if, for example, .thepotential of the serted'into the first jack tomake contact'between the'prongs 21 and 37,

overconductor 12, through resisttnicev 15 to inserted in the respective spring jack Current then,` J flows from the positive conductor or bus10 1 S5 i f tivebus 11, anothergportion,passing throughl the spring jack and *wire 34 tothe biisBQ, overY wire 32 to the lpositive voltmeterten minal, throughthe voltmeter whence it emerges at the negativemterminal 25, and

passes'over a wire 41 to'thenegative bus 11. rlhe voltmeter will give a reading on'the scale 28,' and themovableconductor 12 of the rheostat 151 may be adjusted until the desired voltage value is reached. The plug 4() may be Ainserted in the vparticular spring jack? from timeto time in order to determine anyl voltage ldrop whereupon any necessary. restoration of voltage can be made'by ap,

propriately adjustingthe rheostat.

The respeetiveplates 5, 7 and 9 have con-y nections 42,48 and 44 with 'prongs 45, 46` and 4701l plate testing jacks. The compleinenvtary prongs 48, 49 and 50 have connections 51, 52 and with 'the vpositive voltmeterbus 15. wires eliminating filament 4 is to be tested the plug 40`i`sf'incustomary B-battery to the plates 5, 7 and 9 aie designated 54, 55 and 5'6 in the respective instances. y

Upon desiring,r to tester regulate the voltage' of any vor the .plates the plug l() is inserted in the respective aclzs to close that particular circuit. lt, Yttor example,the'potential'of theV plate is to be tested, the plug 40 is in.- serted between the prongs Ll5 and 48 so that current flows trom the positive conductor '54, over'k the WirelQ, through the respective A A and B batteryvoltages directly, the only requirement being two additional vjacks 57 and 58V similar to those already shown.

l'lfhese'are respectively connected with the busses l0 and 30 by wires 59, GG and with the positive pole oit the B-battery and Vbus 3l by wires 61,' 62, Mention has been made or the possibility of installingthe vtesting circuits in.. lapparatus other than radio f receivers.

"Such installation is intended to'ap'ply'to radio transmiters, as well. An inspection or the,

vdiagram makes it evident that a test of any filament circuit will in no way'interfei'e with any `part oit the radio receiver circuitrother thanrthe one being'tested. Only one plug t0 isv intended to be'used. y

A number oii-theadvantagesof the testingA apparatus maybe'outliiied: T he viilamen'tand plate 'voltage of any tube can be known instantly and conveniently by simply inserting theiplujgrlzoin'the appropriate jack.r Should Ait be found that lthe voltage is either above or below the required value the necessary y adjustments can be madev while the .plug is in place.` A subsequent insertion of the plug rin the same jack willi furnish a check on the original voltage adjustment. Experience has determined that signal impulses are received to better advantage with particular filament voltages. i Successive tests will soon determine the best filament voltage for receiving impulses from av particular transmitting station, and it seems the obvious thing'to do. to keep a log or record with information to the 'foregoing end. The Vincorporation oithe testing circuits increases thevalue ot the radio receiver, and the necessary installation can bemade. at a comparatively low cost.' i y Vhile theconstruction and varrangement of the improved testing apparatus -is'thatof a generally 'preferredfornn obviously, modifications and changes may be made without 4cheparting from the spirit vof the inventionor the scope or' the appended claim'.

`I'claim:i-'. W 'Y l 'Voltage testing apparatus for radioreceivers and the like comprising a jvoltmeter having a pair or positive terminals and one negative terminal, a pair .ot positive voltineter busses connected with'the respective positive terminals, an electron-emission tube including a filament and a plate, a normally open positive potential conductor connected with the plate'and having a connection leading to one ot the positive voltineter-busses, a double-pronged jack interposed in said connoction at which said conductor is open, positive and negative filament busses, a coiinec# tion between onefend of the filament andthe negative filament bus, a rheostat connected between the other end oi the filament and the 'positive bus, a normally open lconnection leading itromthe rlieostat tothe Otlierpositive voltmeter bus, a double pi-ongedjack incorporated in and at which said last con# neetion is open,l and a connection between the negative voltmeter terminal and the negat-ive filament supply bus, leither olif-said jacks being capable oi receiving a plug torclosing aeircuit involving either one or the other of the positivevOltmeter` terminals and the negative terminal, thereby to test either the filament voltage.

plate or y y J WILLIAM HILL. 

